I come from a family of teachers, and I believe ideas matter; the good ones deserve reverence, and the bad ones, defiance.
Modesty means admitting the possibility of error, subsuming the self for the good of the whole, remaining open to surprise and the gifts that only failure can bring. There are many ways to practice it. Try taking up golf. Or making your own bagels. Or raising a teenager.
I don't think it's necessary to shout if you have a good story. But I also don't think you should shy away from being bold in the statement that you're making.
A good president needs a big comfort zone. He should be able to treat enemies as opportunities, appear authentic in joy and grief, stay cool under the hot lights.
The battles after the wars are over can be the toughest; there's no longer the public interest that accompanies, for good and for ill, the start of combat.